Power-distributing system



Patented Aug. 25, 1925.

1,551,275 UNITED STATES, PATENT OFFICE.

CHARLES F. WAGNER, OEPITTSBURGH, AND JOSEPH SLEPIAN, OF SWISSVALE, PENN- SYLVANIA, ASSIGNORS TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COM- PANY, A CORPORATION OF PENNSYLVANIA.

POWER-DISTRIBUTING- SYSTEM.

Application filed September 2, 1922.. Serial No. 585,888.

To all whom it may CONLWL.

Be it known that we, CHARLES F. WAG- NEH, a citizen of the United States, and a. resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania," and J osnPH SLEPIAN, a citizen of the United States, and a resident of Swissvale, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Power-Distributing Systems, of which the following is a specification.

Our invention relates to power-distributing systems and particularly to the arrangement of conductors in polyphase power-distributing systems wherein heavy currents are carried. 1

It has been found that, Where conductors are arranged in inductive relation and wherein the groups of conductors of one phase are placed unsymmetrically with respect to the conductors constituting other phase groups, an unequal current distribution between the conductors of like phase results from the inductive action of theconductors of one group upon the conductors of another group. Such unequal current distribution causes uneven heating of conductors and a reductionin efliciency of the entire group.

One object of our invention is to arrange the conductors of a group of inductivelyrelated conductors of difi'erent phase in such manner that the conductors of one phase occupy substantially similar corresponding relative positions with respect to the conductors of a dilferent phase, thereby equalizing the inductive action of the entire group of conductors between conductors of like phase.

Another object of our invention is to so connect the conductors of a group in which unequal current distribution prevails that, without altering the physical grouping of the conductors, equal distribution of the current is obtained.

.These and other objects, that will be made apparent throughout the further description of our invention, areattained by means of the apparatus hereinafter described, and illustrated inthe accompanying drawings, wherein:

Figure 1 diagrammatically indicates a group of conductors for polyphase clrcuits in which unequal distribution of the current between conductors of like phase prevails.

Fig. 2 is a. diagram indicating the arrangement of the conductors resulting in equal distribution between conductors of like phase, and

Fig. 3 is a diagram indicating a modified arrangement of the conductors wherein their physical grouping has been altered.

As indicated in Fig.1, there are six pairs of conductors d, e, f, g, It and i, the pairs 03 and e constituting a group carrying current of like phase A, the pairs of conductors f and g constituting a group carrying current of like phase B and the'pairs' of conductors h and i constituting a group carrying current of like phase C. It will be ap parent that the current in the conductors 7 will inductively affect the conductors e with greater intensity than the conductors cl which are more remote, and that the conductors and 9 will be differently inductively a ected by the groups of conductors carrying current of phase A and phase C.

By connecting the conductors to the source of current in the manner indicated in Fig. 2, that is, so that the conductors (Z and i constitute the group carrying current of phase A and so that the conductors e and hi constitute the group carrying current of phase B and conductors f and 'g constitute the group carrying current of phase 0, the conductors cl and 11 will be inductively a ected alike by current in the remaining conductors for the reason that they are arranged so thatthey occupy similar corre sponding relative positions with respect to the other conductors.

It will be seen that the conductors for each phase have been divided into pairs disposed symmetrically on opposite sides of the line X Y. The conductors of the pair 6 on one side of the line have similar relative positions with respect to the remaining conductors that the conductors of pair h have with respect to all other conductors. This is also true of the pairs of conductors f and g and pairs d and 2'.

It will be seen, therefore, that, by reason of the arrangement indicated in Fig. 2, the conductors of any pair or phase are inductively affected in like manner and, consequently, the current distribution in the conductors of like phase is equal.

It Will be noted that the physical group that various changes, modifications, substitutions, additions and omissions may be made in the apparatus illustrated without departing from the spirit and scope of our invention, as set forth in the appended claims.

lVe claim as our invention! 1. The method of equalizing inductive effects between conductors of the same phase in a group of inductively-related conductors of different phase which consists in disposing the conductors of like phase symmetrically with respect to a common point in a plane between the conductors.

2. The method of equalizing inductive effects between conductors of the same phase in a group of inductively-related conductors difi'erent phase, which consists in disposing the conductors of one phase so that they occupy similar relative positions with re gust, 1922.

spect to the conductors of different phase.

3. The method of equalizing inductive effectsbetween conductors of the same phase in a group of inductively-related conductors of different phase, which consists in disposing the conductors of each phase so that they occupy similar corresponding relative positions with respect to the conductors of different phase.

4. The method of maintaining equal current distribution between conductors of the same phase in a group of inductively-related conductors of different phase, which consists in dividing the conductors of like phase into equal sub-groups and in disposing each subgroup so that the conductors thereof occupy similar corresponding relative positions with respect to the conductors of sub-groups of different phase. I

5. A current-conducting system for a polyphase circuit comprising a group of inductivelysrelated conductors having the conduc-, tors of like phase so arranged that the conductors of one phase occupy similar corresponding relative positions with respect to the conductors of different phase.

6. The method of equalizing the inductive effect between conductors of, the same phase in a group of inductively-related conductors of different phase, which consists in divid ing the conductors into two groups, each having a conductor of each separate phase,

.and in disposing the conductors in each group in the same relative order with respect to a point between the groups.

In testimony whereof, we have hereunto subscribed our names this 30th day of Au- CHARLES F. WAGNER. JOSEPH SLEPIAN. 

